USGS WPhase Moment Solution

NEAR EAST COAST OF HONSHU, JAPAN

13/ 2/19 12:27:38.00

Epicenter:  35.245  140.957
MW 5.4

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/19 12:27:38.00
Centroid:   35.345  141.446
Depth  30         No. of sta: 27
Moment Tensor;   Scale 10**17 Nm
  Mrr= 0.60       Mtt=-0.71
  Mpp= 0.10       Mrt= 1.53
  Mrp= 0.40       Mtp=-0.11
 Principal axes:
  T  Val=  1.66  Plg=56  Azm=341
  N     =  0.11       3       76
  P     = -1.77      33      168

Best Double Couple:Mo=1.7*10**17
 NP1:Strike=271 Dip=12 Slip= 106
 NP2:        75     79        87

Moment Tensor Solution
The figure above shows a visual representation of the style of faulting (focal mechanism) derived from the estimated moment tensor. Shaded areas show quadrants of the focal sphere in which the P-wave first-motions are away from the source, and unshaded areas show quadrants in which the P-wave first-motions are toward the source. The dots represent the axis of maximum compressional strain (in black, called the "P-axis") and the axis of maximum extensional strain (in white, called the "T-axis") resulting from the earthquake.

Moment Tensor Solution

Details on the W-phase inversion algorithm.